MORE:

Katla is Iceland’s most dangerous volcano and is located underneath the Mýrdalsjökull ice cap.Katla has been showing signs of restlessness recently, with tremors in September exceeding the magnitude 3 mark.The last eruption in Katla occurred in 1918.

Hekla, otherwise known as the ‘Gateway to Hell’, erupted in 2000, sending a cloud of ash up to six kilometres high.Hekla is located in the southern part of the country and has been quiet for sixteen years. But data collected in June last year. revealed it is building up magma.

The Grímsvötn volcano is located underneath the Vatnajökull glacier. In 2011, Grimsvotn erupted, sending a huge plume of ash into the skies, that led to several flights being grounded.

Bardarbunga is a large central volcano lying underneath Iceland’s Vatnajokull glacier, in the centre of the country.It contains a 2,296ft-deep (700 metre) caldera, hidden beneath ice, covered in extensive flank fissures, from where the majority eruptions take place.The most recent eruption began in August 2014, and lasted until February 2015.

With 130 volcanoes – both active and inactive – Iceland is one of the most intensely volcanic places in the world.

The warning follows the 2010′s explosive eruption of Icelandic volcano Eyjafjallajökull, which caused more than 10 million air passengers to be stranded and cost the European economy an estimated £4 billion ($4.9 billion).